National Instruments Computer Drive USB 6501 OEM User Manual

USER GUIDE  
USB-6501 OEM  
This user guide describes how to use the National Instruments USB-6501  
OEM data acquisition (DAQ) device.  
The NI USB-6501 OEM is a full-speed USB 2.0 device that provides  
24 DIO channels and a 32-bit counter.  
Dimensional Drawings  
Figure 1 shows a top view of the USB-6501 OEM. Figure 2 shows the front  
and rear dimensions.  
0.45 in. (11.5 mm)  
0.18 in. (4.5 mm)  
–0.03 in. (–0.8 mm)  
–0.18 in. (–4.6 mm)  
0.125 in. (3.18 mm) Diameter  
2.13 in. (54.1 mm)  
2.26 in. (57.4 mm)  
1.78 in. (45.2 mm)  
1.61 in. (40.8 mm)  
1.45 in. (36.7 mm)  
1.37 in. (34.7 mm)  
0.89 in. (22.7 mm)  
1.13 in. (28.7 mm)  
0.48 in. (12.2 mm)  
0.00 in. (0.0 mm)  
0.13 in. (3.3 mm)  
2.65 in. (67.3 mm)  
2.41 in. (61.2 mm)  
2.04 in. (51.8 mm)  
1.66 in. (42.2 mm)  
0.00 in. (0.0 mm)  
0.33 in. (8.3 mm)  
Figure 1. USB-6501 OEM Dimensions (Top View)  
 
 
I/O Connector and Cable  
Use any 34-pin female IDC (ribbon) cable to connect to the IDC connector  
on the USB-6501 OEM device.  
Table 1 lists the pin assignments and signal names for the IDC connector.  
Table 1. Pin Assignments  
Signal  
P1.0  
Pin  
Connector  
Pin  
Signal  
GND  
1
2
P1.1  
P1.2  
P1.3  
P1.4  
P1.5  
P1.6  
P1.7  
P0.0  
P0.1  
P0.2  
P0.3  
P0.4  
P0.5  
P0.6  
P0.7  
+5V  
3
4
P2.0  
GND  
P2.1  
GND  
P2.2  
GND  
P2.3  
GND  
P2.4  
GND  
P2.5  
GND  
P2.6  
GND  
P2.7  
+5V  
5
6
Pin 1  
Pin 2  
7
8
9
10  
12  
14  
16  
18  
20  
22  
24  
26  
28  
30  
32  
34  
11  
13  
15  
17  
19  
21  
23  
25  
27  
29  
31  
33  
Pin 33  
Pin 34  
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USB-6501 OEM User Guide  
 
 
Signal Descriptions  
Table 2 describes the signals available on the I/O connectors.  
Table 2. Signal Descriptions  
Direction  
Signal Name  
P0.<0..7>  
P1.<0..7>  
P2.<0..6>  
Description  
Input or  
Output  
Digital I/O SignalsYou can individually configure  
each signal as an input or output.  
P2.7 (CTR 0 SRC)  
Input or  
Output  
This pin is configurable as either a digital line or an  
event counter.  
Digital I/O Signal—As a digital line, this signal can be  
used as an input or output.  
CTR—As a counter, this signal can be used as an event  
counter input source.  
+5 V  
GND  
Output  
+5 V—The voltage source provided by the USB host.  
The voltage is nominally 5 V, but varies from system to  
system.  
Ground—The reference for the digital signals and the  
+5 VDC supply.  
Digital I/O  
The USB-6501 OEM has 24 single-ended digital lines, P0.<0..7>,  
P1.<0..7>, and P2.<0..7>, which comprise the three DIO ports. P2.7 can  
also function as a 32-bit counter. Refer to the Event Counter section for  
more information about the counter.  
Static DIO  
Each of the USB-6501 OEM DIO lines can be individually programmed as  
a static DI or DO line. You can use static DIO lines to monitor or control  
digital signals. All samples of static DI lines and updates of DO lines are  
software-timed.  
Source/Sink Information  
The default configuration of the USB-6501 OEM DIO ports is open-drain,  
allowing 5 V operation, with an onboard 4.7 kpull-up resistor. An  
external, user-provided, pull-up resistor can be added to increase the source  
current drive up to a 8.5 mA limit per line, as shown in Figure 4.  
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USB-6501 OEM DIO Box  
Short Circuit Protection  
Current Limiting Circuit  
+5 V  
P0.0  
VBus  
Re  
External  
Pull-up  
Rp  
4.7K Onboard Resistor  
Port Pad  
Resistor  
Rl  
Load  
GND  
A
Figure 4. Example of Connecting External User-Provided Resistor  
Complete the following steps to determine the value of the user-provided  
pull-up resistor:  
1. Place an ammeter in series with the load.  
2. Place a variable resistor between the digital output line and the +5 V.  
3. Adjust the variable resistor until the ammeter current reads as the  
intended current. The intended current must be less than 8.5 mA.  
4. Remove the ammeter and variable resistor from your circuit.  
5. Measure the resistance of the variable resistor. The measured  
resistance is the ideal value of the pull-up resistor.  
6. Select a static resistor value for your pull-up resistor that is greater than  
or equal to the ideal resistance.  
7. Reconnect the load circuit and the pull-up resistor.  
Additionally, you can configure the USB-6501 OEM DIO ports as  
push-pull.  
Digital I/O Circuitry  
Figure 5 shows P0.<0..7> connected to example signals configured as  
digital inputs and digital outputs. You can configure P1.<0..7> and  
P2.<0..7> similarly. Refer to Figure 4 for some common examples of  
connections of DIO lines with standard circuits.  
© National Instruments Corporation  
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USB-6501 OEM User Guide  
 
 
+5 V  
1
LED  
P0.0  
P0.1  
P0.2  
P0.3  
P0.4  
P0.5  
P0.6  
P0.7  
LED  
2
3
4
+5 V  
TTL Signal  
Switch  
GND  
I/O Connector  
1
2
3
4
P0.0 configured as an open-drain digital output driving a LED  
P0.2 configured as a push-pull digital output driving a LED  
P0.4 configured as a digital input receiving a TTL signal from a gated inverter  
P0.7 configured as a digital input receiving a 0 V or 5 V signal from a switch  
Figure 5. Example of Connecting a Load  
Caution Exceeding the maximum input voltage ratings or maximum output ratings, which  
are listed in the Specifications section, can damage the DAQ device and the computer.  
National Instruments is not liable for any damage resulting from such signal connections.  
I/O Protection  
Each DIO signal is protected against overvoltage, undervoltage, and  
overcurrent conditions, as well as ESD events. However, you should avoid  
these fault conditions by using the following guidelines:  
If you configure a DIO line as an output, do not connect it to any  
external signal source, ground signal, or power supply.  
If you configure a DIO line as an output, understand the current  
requirements of the load connected to these signals. Do not exceed the  
specified current output limits of the DAQ device.  
If you configure a DIO line as an input, do not drive the line with  
voltages outside of its normal operating range.  
Treat the DAQ device as you would treat any static sensitive device.  
Always properly ground yourself and the equipment when handling  
the DAQ device or connecting to it.  
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Power-On States  
At system startup and reset, the hardware sets all DIO lines to  
high-impedance inputs. The DAQ device does not drive the signal high  
or low. Each line has a weak pull-up resistor connected to it.  
Event Counter  
You can configure P2.7 as the source for a 32-bit counter. In this mode, the  
device counts high to low transitions on P2.7. The counter can be armed  
and disarmed and the count can be read or reset through software. Refer to  
your software documentation for more information about counter  
programming techniques.  
+5 V Power Source  
Caution When using the 5 V source, understand the current requirements of the load  
connected. Do not exceed the specified current output limits of the USB Vbus.  
The USB-6501 OEM supplies a nominal 5 V from two pins on the front  
IDC connector. The voltage source is provided by the USB host. The  
voltage is nominally 5 V, but varies from system to system. Refer to the  
Specifications section for more information about USB bus power  
specifications. This source can be used to power external components.  
Note While the device is in USB suspend, the output is disabled.  
Specifications  
The following specifications are typical at 25 °C, unless otherwise noted.  
Digital I/O  
Number of lines  
P0.<0..7>......................................... 8  
P1.<0..7>......................................... 8  
P2.<0..7>......................................... 8  
Direction control .................................... Input or output,  
software-selectable  
Output driver type .................................. Push-pull or open-drain,  
software selectable  
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Pull-up resistor........................................4.7 kVBus (nominally 5 V)  
Absolute voltage range ...........................–0.5 to 5.8 V with respect to GND  
Power-on state ........................................Input (high impedance)  
Digital logic levels  
Level  
Min  
Max  
Units  
Input  
Input low voltage  
Input high voltage  
Input leakage current  
–0.3  
2.0  
0.8  
5.8  
50  
V
V
µA  
Output  
Output low voltage (I = 8.5 mA)  
Output high voltage  
0.8  
V
Push-pull, I = –8.5 mA  
Open-drain, I = –0.6 mA, nominal  
Open-drain, I = –8.5 mA, with external pull-up resistor  
2.0  
2.0  
2.0  
3.5  
5.0  
V
V
V
Counter  
Number of counters ................................1 (P2.7 can be configured as  
a counter)  
Resolution...............................................32 bits  
Counter measurements ...........................Falling edge counting  
Maximum input frequency .....................5 MHz  
Minimum high pulse width.....................100 ns  
Minimum low pulse width......................100 ns  
Bus Interface  
USB specification...................................USB 2.0 full-speed (12 Mb/s)  
External Voltage  
+5 V output  
Voltage ............................................4.10 V min, 5.25 V max  
Current.............................................230 mA max  
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Power Requirements  
USB  
4.10 to 5.25 VDC............................ 80 mA typical, 500 mA max  
USB Suspend .................................. 300 µA standby mode,  
500 µA max  
Physical Characteristics  
Dimensions ............................................ 5.74 cm × 6.73 cm × 1.15 cm  
(2.26 in. × 2.65 in. × 0.45 in.)  
I/O connectors........................................ USB series B receptacle; 34-pin  
IDC ribbon cable header  
Weight.................................................... 21 g (.74 oz)  
Safety  
Standards  
The USB-6501 is designed to meet the requirements of the following  
standards of safety for electrical equipment for measurement, control,  
and laboratory use:  
IEC 61010-1, EN 61010-1  
UL 61010-1  
CAN/CSA-C22.2 No. 61010-1  
Note For UL and other safety certifications, refer to the product label, or visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
Overvoltage Protection  
Connect only voltages that are within these limits.  
Channel-to-COM (one channel)............. 30 V max,  
Measurement Category I  
Channels-to-COM  
(one port, all channels)........................... 8.9 V max,  
Measurement Category I  
Measurement Category I is for measurements performed on circuits not  
directly connected to the electrical distribution system referred to as  
MAINS voltage. MAINS is a hazardous live electrical supply system that  
powers equipment. This category is for measurements of voltages from  
© National Instruments Corporation  
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USB-6501 OEM User Guide  
 
specially protected secondary circuits. Such voltage measurements include  
signal levels, special equipment, limited-energy parts of equipment,  
circuits powered by regulated low-voltage sources, and electronics.  
Caution Do not use this module for connection to signals or for measurements within  
Measurement Categories II, III, or IV.  
Hazardous Locations  
The USB-6501 is not certified for use in hazardous locations.  
Environmental  
The USB-6501 device is intended for indoor use only.  
Operating temperature  
(IEC 60068-2-1 and IEC 60068-2-2)......0 to 55 °C  
Operating humidity  
(IEC 60068-2-56) ...................................10 to 90% RH, noncondensing  
Maximum altitude...................................2,000 m (at 25 °C ambient  
temperature)  
Storage temperature  
(IEC 60068-2-1 and IEC 60068-2-2)......–40 to 85 °C  
Storage humidity  
(IEC 60068-2-56) ..................................5 to 90% RH, noncondensing  
Pollution Degree (IEC 60664)................2  
EMC/EMI ...............................................CE, C-Tick, and FCC Part 15  
(Class A) Compliant  
CE Compliance  
The USB-6501 OEM device is intended to be used as part of a system. To  
ensure that your system meets the appropriate CE Compliance regulations,  
you must test the entire system.  
This product meets the essential requirements of applicable European  
Directives, as amended for CE marking, as follows:  
Low-Voltage Directive (safety)..............73/23/EEC  
Electromagnetic Compatibility  
Directive (EMC).....................................89/336/EEC  
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Note Refer to the Declaration of Conformity (DoC) for this product for any additional  
regulatory compliance information. To obtain the DoC for this product, visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
Safety Guidelines  
Caution Operate the hardware only as described in these operating instructions.  
The following section contains important safety information that you must  
follow when installing and using the USB-6501 OEM device.  
Do not operate the USB-6501 OEM device in a manner not specified in this  
document. Misuse of the device can result in a hazard. You can compromise  
the safety protection built into the device if the device is damaged in any  
way. If the device is damaged, contact National Instruments for repair.  
Do not substitute parts or modify the device except as described in this  
document. Use the device only with the chassis, modules, accessories, and  
cables specified in the installation instructions. You must have all covers  
and filler panels installed during operation of the device.  
Do not operate the device in an explosive atmosphere or where there may  
be flammable gases or fumes. If you must operate the device in such an  
environment, it must be in a suitably rated enclosure.  
If you need to clean the device, use a dry cloth. Make sure that the device  
is completely dry and free from contaminants before returning it to service.  
Operate the device only at or below Pollution Degree 2. Pollution is foreign  
matter in a solid, liquid, or gaseous state that can reduce dielectric strength  
or surface resistivity. The following is a description of pollution degrees:  
Pollution Degree 1 means no pollution or only dry, nonconductive  
pollution occurs. The pollution has no influence.  
Pollution Degree 2 means that only nonconductive pollution occurs in  
most cases. Occasionally, however, a temporary conductivity caused  
by condensation must be expected.  
Pollution Degree 3 means that conductive pollution occurs, or dry,  
nonconductive pollution occurs that becomes conductive due to  
condensation.  
You must insulate signal connections for the maximum voltage for which  
the device is rated. Do not exceed the maximum ratings for the device. Do  
not install wiring while the device is live with electrical signals. Do not  
remove or add connector blocks when power is connected to the system.  
© National Instruments Corporation  
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USB-6501 OEM User Guide  
 
 
Avoid contact between your body and the connector block signal when hot  
swapping modules. Remove power from signal lines before connecting  
them to or disconnecting them from the device.  
Operate the device at or below the Measurement Category I1. Measurement  
circuits are subjected to working voltages2 and transient stresses  
(overvoltage) from the circuit to which they are connected during  
measurement or test. Measurement categories establish standard impulse  
withstand voltage levels that commonly occur in electrical distribution  
systems. The following is a description of measurement categories:  
Measurement Category I is for measurements performed on circuits  
not directly connected to the electrical distribution system referred to  
as MAINS3 voltage. This category is for measurements of voltages  
from specially protected secondary circuits. Such voltage  
measurements include signal levels, special equipment, limited-energy  
parts of equipment, circuits powered by regulated low-voltage sources,  
and electronics.  
Measurement Category II is for measurements performed on circuits  
directly connected to the electrical distribution system. This category  
refers to local-level electrical distribution, such as that provided by a  
standard wall outlet (for example, 115 V for U.S. or 230 V for Europe).  
Examples of Measurement Category II are measurements performed  
on household appliances, portable tools, and similar E Series devices.  
Measurement Category III is for measurements performed in the  
building installation at the distribution level. This category refers to  
measurements on hard-wired equipment such as equipment in fixed  
installations, distribution boards, and circuit breakers. Other examples  
are wiring, including cables, bus-bars, junction boxes, switches,  
socket-outlets in the fixed installation, and stationary motors with  
permanent connections to fixed installations.  
Measurement Category IV is for measurements performed at the  
primary electrical supply installation (<1,000 V). Examples include  
electricity meters and measurements on primary overcurrent  
protection devices and on ripple control units.  
1
Measurement Category as defined in electrical safety standard IEC 61010-1. Measurement Category is also referred to as  
Installation Category.  
2
3
Working Voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.  
MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may  
be connected to the MAINS for measuring purposes.  
USB-6501 OEM User Guide  
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Where to Go for Support  
The National Instruments Web site is your complete resource for technical  
support. At ni.com/support you have access to everything from  
troubleshooting and application development self-help resources to email  
and phone assistance from NI Application Engineers.  
National Instruments corporate headquarters is located at  
11500 North Mopac Expressway, Austin, Texas, 78759-3504.  
National Instruments also has offices located around the world to help  
address your support needs. For telephone support in the United States,  
create your service request at ni.com/support and follow the calling  
instructions or dial 512 795 8248. For telephone support outside the United  
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National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.  
Refer to the Terms of Use section on ni.com/legal for more information about National  
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade  
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© 2005 National Instruments Corporation. All rights reserved.  
371594A-01  
May05  
 

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